Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method of wireless communication of a user equipment (UE), comprising: receiving a first Demodulation Reference Signal (DMRS) on a serving control channel of the UE; determining that a random access event has occurred; receiving a plurality of down-link reference signals each being a Synchronization Signal Block (SSB) or a channel state information reference signal (CSI-RS); selecting a first down-link reference signal from the plurality of down-link reference signals, the first down-link reference signal being quasi-colocated with the first DMRS and UE-specifically configured or predefined; selecting a first message from a group of messages that each are associated with the first down-link reference signal; and sending the first message to a base station to request a random access to the base station.
This invention relates to wireless communication systems and addresses the problem of initiating random access procedures in user equipment. The method involves a user equipment (UE) that first receives a Demodulation Reference Signal (DMRS) on its serving control channel. The UE then determines that a random access event has occurred. Subsequently, the UE receives multiple downlink reference signals, which can be either a Synchronization Signal Block (SSB) or a Channel State Information Reference Signal (CSI-RS). From this collection of downlink reference signals, the UE selects a first downlink reference signal. This selected reference signal must be quasi-colocated with the initial DMRS received and is either configured specifically for the UE or is predefined. Following this selection, the UE chooses a first message from a set of messages. Each message in this set is associated with the selected first downlink reference signal. Finally, the UE transmits this selected first message to a base station in order to request a random access to that base station.
2. The method of claim 1 , wherein the first message includes a preamble sequence, wherein the first message is selected from a group of messages that are associated with the first down-link reference signal.
This invention relates to wireless communication systems, specifically methods for transmitting and receiving messages in a network. The problem addressed is improving the reliability and efficiency of message transmission in scenarios where multiple devices share communication resources, such as in cellular or IoT networks. The method involves transmitting a first message from a base station to a user device, where the first message includes a preamble sequence. The preamble sequence helps the user device synchronize with the base station and identify the message. The first message is selected from a predefined group of messages that are associated with a first downlink reference signal. The downlink reference signal is a known signal transmitted by the base station to assist the user device in estimating channel conditions and decoding the message. By associating the message with the downlink reference signal, the system ensures that the user device can accurately receive and interpret the message. The preamble sequence in the first message allows the user device to detect the message even in noisy or interference-prone environments. The association with the downlink reference signal ensures that the message is compatible with the current channel conditions, improving transmission reliability. This method is particularly useful in scenarios where multiple devices compete for limited communication resources, such as in massive machine-type communications (mMTC) or ultra-reliable low-latency communications (URLLC). The technique enhances message detection and decoding efficiency while reducing the risk of errors.
3. The method of claim 1 , wherein the first down-link reference signal is a synchronization signal block.
A method for wireless communication involves transmitting a first downlink reference signal from a base station to a user equipment (UE) to facilitate initial access or synchronization. The first downlink reference signal is specifically a synchronization signal block (SSB), which includes primary synchronization signals (PSS), secondary synchronization signals (SSS), and physical broadcast channels (PBCH). The SSB enables the UE to detect the base station, acquire timing information, and obtain essential system parameters. The method further includes transmitting a second downlink reference signal, which may be a channel state information reference signal (CSI-RS), to assist in channel estimation and beam management. The UE uses these signals to establish and maintain a reliable communication link with the base station, improving synchronization and data transmission efficiency in wireless networks. The method ensures robust initial access and beam alignment, particularly in scenarios with high mobility or challenging propagation conditions.
4. The method of claim 1 , wherein the first down-link reference signal is directly quasi-colocated with the first DMRS.
A method for wireless communication involves transmitting a first downlink reference signal (DL-RS) that is directly quasi-colocated (QCL) with a first demodulation reference signal (DMRS). This technique is used in wireless communication systems, particularly in scenarios where precise channel estimation and signal demodulation are required. The direct QCL relationship ensures that the first DL-RS and the first DMRS share the same large-scale channel properties, such as Doppler shift, Doppler spread, average delay spread, delay spread, spatial receive parameters, and spatial transmit parameters. This allows a receiving device to use the first DL-RS to accurately estimate the channel conditions for demodulating the first DMRS, improving signal reliability and performance. The method may be applied in various wireless communication standards, including 5G and beyond, where efficient reference signal design is critical for supporting high data rates and low-latency communication. The direct QCL relationship simplifies channel estimation by reducing the need for additional reference signals, thereby optimizing resource utilization and enhancing system efficiency. This approach is particularly useful in scenarios with dynamic channel conditions, where accurate and timely channel estimation is essential for maintaining communication quality.
5. The method of claim 1 , wherein the first down-link reference signal is quasi-colocated with the first DMRS through one or more intermediate signals.
A method for wireless communication involves transmitting a first downlink reference signal (DL-RS) that is quasi-colocated (QCL) with a first demodulation reference signal (DMRS) through one or more intermediate signals. Quasi-colocation means that certain large-scale properties, such as Doppler shift, Doppler spread, average delay, and delay spread, are the same between the DL-RS and the DMRS. The intermediate signals facilitate this QCL relationship, ensuring that the DMRS can be used to estimate channel characteristics for the DL-RS. This technique improves signal reliability and accuracy in wireless communications, particularly in scenarios where direct QCL between the DL-RS and DMRS is not feasible. The method may be applied in systems like 5G New Radio (NR) or other advanced wireless networks where precise channel estimation is critical for data transmission and reception. By leveraging intermediate signals, the method ensures that the DMRS can effectively serve as a reference for the DL-RS, enhancing overall system performance.
6. The method of claim 1 , wherein, when the UE is in a connected state, the random access event includes at least one of: reception of a request from the base station to initiate a random access to the base station; a handover of the UE from a second base station to the base station; an up-link data arrival without up-link synchronization; a down-link data arrival without up-link synchronization; and a beam failure recovery request.
This invention relates to wireless communication systems, specifically methods for handling random access events in a user equipment (UE) device when it is in a connected state. The problem addressed is ensuring efficient and reliable communication between the UE and a base station during various scenarios that require random access procedures. The method involves detecting a random access event in a UE that is already connected to a base station. The random access event can include several scenarios: receiving a request from the base station to initiate random access, a handover of the UE from a second base station to the current base station, the arrival of uplink data when the UE lacks uplink synchronization, the arrival of downlink data when the UE lacks uplink synchronization, or a beam failure recovery request. These events trigger the UE to perform a random access procedure to re-establish synchronization with the base station, ensuring proper communication continuity. The method ensures that the UE can handle different types of random access events efficiently, maintaining stable communication links in dynamic network conditions. This is particularly important for scenarios like handover, data transmission without synchronization, and beam failure recovery, where timely and accurate random access is critical for network performance.
7. The method of claim 6 , further comprising: receiving a second message from the base station in response to the first message by assuming that a DMRS included in the request and a DMRS included in the second message are quasi-colocated.
This invention relates to wireless communication systems, specifically improving the efficiency and reliability of downlink control information (DCI) transmission in scenarios involving demodulation reference signals (DMRS). The problem addressed is the need for accurate channel estimation and synchronization when a user equipment (UE) receives DCI from a base station, particularly in cases where the UE must assume quasi-colocation (QCL) between DMRS in different messages. The method involves a UE transmitting a first message to a base station, where the first message includes a request for DCI. The UE then receives a second message from the base station in response to the first message. A key aspect of this method is that the UE assumes quasi-colocation between the DMRS included in the request (first message) and the DMRS included in the second message. Quasi-colocation means the UE treats the DMRS in both messages as having the same or similar channel properties, such as Doppler shift, delay spread, or spatial parameters. This assumption allows the UE to use channel estimates derived from one DMRS to process the other, improving signal decoding efficiency and reducing overhead. The method may also include the UE receiving configuration information from the base station, which specifies the QCL relationship between the DMRS in the request and the DMRS in the response. This ensures the UE correctly interprets the QCL assumption, avoiding misalignment in channel estimation. The technique is particularly useful in scenarios where latency and resource efficiency are critical, such as in 5G New Radio (NR) systems.
8. The method of claim 7 , wherein the random access event is the reception of the request, wherein the request is a physical downlink control channel (PDCCH) order, wherein the second message includes a PDCCH command and a random access response.
This invention relates to wireless communication systems, specifically methods for handling random access events in a network. The problem addressed is improving the efficiency and reliability of random access procedures, particularly when triggered by a physical downlink control channel (PDCCH) order. The method involves detecting a random access event, which is defined as the reception of a request from a network node. The request is a PDCCH order, which is a command sent by the network to initiate a random access procedure. Upon detecting this event, the system transmits a second message that includes both a PDCCH command and a random access response. The PDCCH command provides additional control information, while the random access response contains timing advance and resource allocation details to synchronize the device with the network. This approach ensures faster and more coordinated random access, reducing latency and improving overall system performance. The method is particularly useful in scenarios where quick synchronization is critical, such as in high-mobility environments or during handover procedures. By combining the PDCCH command with the random access response, the system optimizes the signaling process, minimizing delays and enhancing reliability.
9. The method of claim 7 , wherein the random access event is the beam failure recovery request, wherein the second message is scrambled by a cell radio network temporary identifier (C-RNTI) of the UE.
In wireless communication systems, particularly in 5G and beyond, beam failure recovery is critical for maintaining reliable connections when a user equipment (UE) loses synchronization with its serving base station. The problem arises when the UE experiences beam failure and needs to request recovery, but the initial request may not be properly identified or processed by the network due to lack of synchronization. This invention addresses this issue by improving the beam failure recovery process. The method involves a UE detecting a beam failure and initiating a random access procedure to request recovery. The UE transmits a first message, such as a preamble, to the network. In response, the network sends a second message, which is scrambled using the UE's cell radio network temporary identifier (C-RNTI). This scrambling ensures that the second message is securely and uniquely associated with the UE, preventing misidentification or interference from other devices. The use of C-RNTI in scrambling enhances reliability and reduces the risk of collisions during the recovery process. The method ensures that the UE can quickly re-establish communication with the network after a beam failure, improving overall system robustness and user experience.
10. An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising: a memory; and at least one processor coupled to the memory and configured to: receive a first Demodulation Reference Signal (DMRS) on a serving control channel of the UE; determine that a random access event has occurred; receive a plurality of down-link reference signals each being a Synchronization Signal Block (SSB) or a channel state information reference signal (CSI-RS); select a first down-link reference signal from the plurality of down-link reference signals, the first down-link reference signal being quasi-colocated with the first DMRS and UE-specifically configured or predefined; select a first message from a group of messages that each are associated with the first down-link reference signal; and send the first message to a base station to request a random access to the base station.
This invention relates to wireless communication systems, specifically improving random access procedures in user equipment (UE) devices. The problem addressed is efficient and reliable random access in scenarios where multiple downlink reference signals (such as Synchronization Signal Blocks (SSBs) or Channel State Information Reference Signals (CSI-RS)) are available. The solution involves a UE that receives a first Demodulation Reference Signal (DMRS) on its serving control channel. Upon detecting a random access event, the UE receives multiple downlink reference signals. It then selects a specific downlink reference signal that is quasi-colocated with the first DMRS and is either UE-specifically configured or predefined. The UE further selects a message from a predefined group of messages associated with the chosen downlink reference signal and transmits this message to a base station to initiate random access. This approach ensures that the UE uses a reference signal with known channel characteristics, improving the reliability of the random access procedure. The method optimizes resource usage and reduces latency by leveraging quasi-colocation and preconfigured associations between reference signals and messages.
11. The apparatus of claim 10 , wherein the first message includes a preamble sequence, wherein the first message is selected from a group of messages that are associated with the first down-link reference signal.
This invention relates to wireless communication systems, specifically improving synchronization and message transmission between a base station and a user device. The problem addressed is ensuring reliable communication in dynamic environments where signal conditions vary, leading to synchronization errors and message misinterpretation. The apparatus includes a transmitter configured to send a first message to a user device, where the first message contains a preamble sequence. The preamble sequence is a known pattern that helps the user device detect and synchronize with the incoming signal. The first message is selected from a predefined group of messages, each associated with a specific first downlink reference signal. The downlink reference signal is a periodic transmission used by the user device to estimate channel conditions and adjust its receiver settings. By associating the first message with a particular reference signal, the system ensures that the user device can correctly interpret the message based on the reference signal it has already received. The apparatus also includes a receiver configured to receive a second message from the user device in response to the first message. The second message may include a preamble sequence similar to the first message, ensuring bidirectional synchronization. The system may further include a processor to determine the timing and content of the messages based on the reference signals, optimizing communication efficiency and reliability. This approach reduces errors in message detection and improves overall system performance in varying signal conditions.
12. The apparatus of claim 10 , wherein the first down-link reference signal is a synchronization signal block.
A wireless communication apparatus includes a transmitter configured to transmit a first downlink reference signal to a user equipment (UE) and a receiver configured to receive an uplink signal from the UE. The apparatus further includes a processor that determines a timing advance (TA) value based on the uplink signal and adjusts the TA value for the UE. The processor also determines a second downlink reference signal based on the adjusted TA value and transmits the second downlink reference signal to the UE. The first downlink reference signal is a synchronization signal block (SSB), which is used for initial cell synchronization and beam alignment. The second downlink reference signal is transmitted with the adjusted TA value to compensate for propagation delays and ensure proper timing alignment between the UE and the apparatus. This process improves synchronization and reduces interference in wireless communication systems, particularly in scenarios where precise timing is critical, such as in 5G networks. The apparatus may be part of a base station or a distributed antenna system, and the UE may be a mobile device or IoT device. The method ensures efficient synchronization and timing alignment, enhancing overall system performance.
13. The apparatus of claim 10 , wherein the first down-link reference signal is directly quasi-colocated with the first DMRS.
A wireless communication apparatus includes a transmitter configured to transmit a first downlink reference signal and a first demodulation reference signal (DMRS) to a user equipment (UE). The first downlink reference signal is directly quasi-colocated (QCL) with the first DMRS. Quasi-colocation means that the UE can assume certain channel properties, such as Doppler shift, Doppler spread, average delay, and delay spread, are the same for both signals. This allows the UE to use channel estimates derived from the first DMRS to demodulate the first downlink reference signal, improving signal reception accuracy and reducing computational overhead. The apparatus may also include a receiver to receive uplink signals from the UE, and the transmitter may further transmit additional downlink reference signals and DMRSs for other communication channels or beams. The direct QCL relationship simplifies UE processing by eliminating the need for separate channel estimation for the downlink reference signal, enhancing system efficiency in wireless networks such as 5G or beyond.
14. The apparatus of claim 10 , wherein the first down-link reference signal is quasi-colocated with the first DMRS through one or more intermediate signals.
This invention relates to wireless communication systems, specifically improving the accuracy and efficiency of downlink reference signal (DL-RS) transmission in scenarios involving quasi-colocation (QCL) relationships. The problem addressed is the need for reliable signal transmission in environments where direct QCL between a downlink reference signal and a demodulation reference signal (DMRS) is not feasible, potentially leading to synchronization or channel estimation errors. The apparatus includes a transmitter configured to generate a first downlink reference signal and a first demodulation reference signal (DMRS) for wireless communication. The first downlink reference signal is quasi-colocated with the first DMRS through one or more intermediate signals. Quasi-colocation in this context means that the intermediate signals share certain properties (such as Doppler shift, delay spread, or spatial parameters) with both the downlink reference signal and the DMRS, enabling the receiver to infer these properties indirectly. This indirect QCL relationship ensures that the receiver can accurately estimate the channel and demodulate the transmitted data even when direct QCL is not possible. The intermediate signals may include other reference signals or synchronization signals that act as a bridge between the downlink reference signal and the DMRS, maintaining signal integrity and reducing overhead. This approach enhances signal reliability in dynamic wireless environments, such as those with high mobility or complex multipath conditions.
15. The apparatus of claim 10 , wherein, when the UE is in a connected state, the random access event includes at least one of: reception of a request from the base station to initiate a random access to the base station; a handover of the UE from a second base station to the base station; an up-link data arrival without up-link synchronization; a down-link data arrival without up-link synchronization; and a beam failure recovery request.
This invention relates to wireless communication systems, specifically improving random access procedures for user equipment (UE) in a connected state. The problem addressed is the need for efficient and reliable random access mechanisms when a UE must re-establish synchronization with a base station under various conditions. The apparatus includes a UE configured to perform random access to a base station when in a connected state. The random access event can be triggered by multiple scenarios, including receiving a request from the base station to initiate random access, a handover from a second base station to the base station, uplink data arrival without uplink synchronization, downlink data arrival without uplink synchronization, or a beam failure recovery request. The UE is designed to handle these events to maintain or re-establish communication with the base station, ensuring seamless connectivity and minimizing service disruptions. The apparatus may also include a base station that communicates with the UE, managing the random access procedures and coordinating with other base stations during handovers. The system ensures that the UE can quickly and efficiently re-synchronize with the network, improving overall system performance and user experience. This invention is particularly relevant in scenarios where mobility, beam management, or data transmission requirements necessitate frequent synchronization adjustments.
16. The apparatus of claim 15 , wherein the at least one processor is further configured to: receive a second message from the base station in response to the first message by assuming that a DMRS included in the request and a DMRS included in the second message are quasi-colocated.
This invention relates to wireless communication systems, specifically improving the efficiency and reliability of data transmission between a user device and a base station. The problem addressed is the need for accurate channel state information (CSI) feedback and efficient demodulation reference signal (DMRS) handling in wireless networks, particularly in scenarios where quasi-colocation (QCL) assumptions are applied to reduce signaling overhead and processing complexity. The apparatus includes at least one processor configured to transmit a first message to a base station, where the first message includes a request for channel state information reference signal (CSI-RS) resources. The processor is also configured to receive a second message from the base station in response to the first message, assuming that the DMRS included in the request and the DMRS included in the second message are quasi-colocated. Quasi-colocation means that certain properties (such as Doppler shift, delay spread, or spatial parameters) of the DMRS in the request and the DMRS in the response are assumed to be the same, allowing the device to use the same channel estimation for both signals. This reduces the need for redundant measurements and improves communication efficiency. The apparatus may also include a memory coupled to the processor and a transceiver for wireless communication. The invention enhances wireless communication by optimizing DMRS handling and leveraging QCL assumptions to improve data transmission reliability and reduce processing overhead.
17. The apparatus of claim 16 , wherein the random access event is the reception of the request, wherein the request is a physical downlink control channel (PDCCH) order, wherein the second message includes a PDCCH command and a random access response.
This invention relates to wireless communication systems, specifically improving the handling of random access events in cellular networks. The problem addressed is the inefficiency in current random access procedures, which can lead to delays and resource wastage when a user device needs to establish or re-establish a connection with a base station. The apparatus includes a base station configured to manage random access events triggered by a user device. The base station receives a request from the user device, which is a physical downlink control channel (PDCCH) order. This request initiates a random access event, prompting the base station to transmit a second message to the user device. The second message includes a PDCCH command and a random access response. The PDCCH command provides control information, while the random access response includes timing advance and resource allocation details to synchronize the user device with the network. This approach optimizes the random access process by reducing latency and improving resource utilization, particularly in scenarios where quick synchronization is required, such as handover or re-establishment procedures. The invention enhances the efficiency of wireless communication by streamlining the interaction between the base station and user devices during random access events.
18. The apparatus of claim 16 , wherein the random access event is the beam failure recovery request, wherein the second message is scrambled by a cell radio network temporary identifier (C-RNTI) of the UE.
This invention relates to wireless communication systems, specifically improving the reliability and efficiency of random access procedures in scenarios such as beam failure recovery. The problem addressed is the need for a more robust and secure method of handling random access events, particularly when a user equipment (UE) experiences beam failure and must recover communication with the network. The apparatus includes a UE configured to transmit a first message during a random access procedure, such as a beam failure recovery request. The UE then receives a second message from the network, which is scrambled using a cell radio network temporary identifier (C-RNTI) assigned to the UE. This scrambling ensures that the second message is securely and uniquely addressed to the specific UE, preventing miscommunication with other devices. The use of C-RNTI for scrambling enhances security and reduces the risk of interference or unauthorized access during the recovery process. The apparatus may also include a network node, such as a base station, that generates and transmits the scrambled second message to the UE, ensuring proper synchronization and recovery of the communication link. This method improves the reliability of beam failure recovery by ensuring that the UE correctly identifies and processes the network's response.
19. A non-transitory computer-readable medium storing computer executable code for wireless communication of wireless equipment, comprising code to: receive a first Demodulation Reference Signal (DMRS) on a serving control channel of the UE; determine that a random access event has occurred; receive a plurality of down-link reference signals each being a Synchronization Signal Block (SSB) or a channel state information reference signal (CSI-RS); select a first down-link reference signal from the plurality of down-link reference signals, the first down-link reference signal being quasi-colocated with the first DMRS and UE-specifically configured or predefined; select a first message from a group of messages that each are associated with the first down-link reference signal; and send the first message to a base station to request a random access to the base station.
This invention relates to wireless communication systems, specifically improving random access procedures in user equipment (UE) devices. The problem addressed is the need for efficient and reliable random access in wireless networks, particularly when selecting appropriate reference signals for synchronization and channel state information. The invention involves a computer-readable medium storing executable code for wireless communication in UE devices. The code enables the UE to receive a first Demodulation Reference Signal (DMRS) on a serving control channel. Upon detecting a random access event, the UE receives multiple downlink reference signals, which can be Synchronization Signal Blocks (SSBs) or Channel State Information Reference Signals (CSI-RSs). The UE then selects a specific downlink reference signal from these signals, ensuring it is quasi-colocated with the first DMRS and is either UE-specifically configured or predefined. The UE further selects a message from a predefined group of messages, where each message is associated with the chosen downlink reference signal. Finally, the UE sends this selected message to a base station to initiate random access. This approach enhances random access reliability by leveraging quasi-colocation and UE-specific configurations, ensuring better synchronization and channel state estimation during the random access process.
20. The non-transitory computer-readable medium of claim 19 , wherein the first message includes a preamble sequence, wherein the first message is selected from a group of messages that are associated with the first down-link reference signal.
This invention relates to wireless communication systems, specifically methods for transmitting and receiving messages in a network. The problem addressed is the need for efficient and reliable message transmission in wireless networks, particularly in scenarios where multiple messages are associated with a downlink reference signal. The invention provides a non-transitory computer-readable medium storing instructions that, when executed, cause a processor to perform operations for handling such messages. The operations include transmitting a first message that includes a preamble sequence, where the first message is selected from a group of messages associated with a first downlink reference signal. The preamble sequence helps in synchronization and identification of the message. The downlink reference signal is used for channel estimation and other purposes in wireless communication. The invention also involves receiving a second message in response to the first message, where the second message includes a preamble sequence and is selected from a group of messages associated with a second downlink reference signal. The second downlink reference signal may be different from the first, allowing for flexibility in message transmission and reception. The invention ensures that messages are properly aligned and synchronized with their respective downlink reference signals, improving communication reliability and efficiency in wireless networks.
Unknown
November 17, 2020
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.